Function: poldisc
Section: polynomials
C-Name: poldisc0
Prototype: GDn
Help: poldisc(pol,{v}): discriminant of the polynomial pol, with respect to main
 variable if v is omitted, with respect to v otherwise.
Description:
 (pol):gen        discsr($1)
 (gen):gen        poldisc0($1, -1)
 (gen, var):gen   poldisc0($1, $2)
Doc: discriminant of the polynomial
 \var{pol} in the main variable if $v$ is omitted, in $v$ otherwise. The
 algorithm used is the \idx{subresultant algorithm}.